/**
 * @license
 * Copyright 2019 Google Inc. All Rights Reserved.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * =============================================================================
 */

import resolve from 'rollup-plugin-node-resolve';
import {terser} from 'rollup-plugin-terser';
import typescript from 'rollup-plugin-typescript2';

const settings = {
  name: 'deeplab',
  preamble: `/**
    * @license
    * Copyright ${(new Date).getFullYear()} Google LLC. All Rights Reserved.
    * Licensed under the Apache License, Version 2.0 (the "License");
    * you may not use this file except in compliance with the License.
    * You may obtain a copy of the License at
    *
    * http://www.apache.org/licenses/LICENSE-2.0
    *
    * Unless required by applicable law or agreed to in writing, software
    * distributed under the License is distributed on an "AS IS" BASIS,
    * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    * See the License for the specific language governing permissions and
    * limitations under the License.
    * =============================================================================
    */`
};

function minify() {
  return terser({
    output: {
      preamble: settings['preamble'],
    },
    ecma: 8,
    module: true,
    compress: true,
    mangle: {reserved: ['tf']},
  });
}

function config({plugins = [], output = {}}) {
  return {
    input: 'src/index.ts',
    plugins: [
      typescript({
        tsconfigOverride: {
          compilerOptions: {
            module: 'ES2015',
          },
        },
      }),
      resolve(),
      ...plugins,
    ],
    output: {
      banner: settings['preamble'],
      globals: {
        '@tensorflow/tfjs-core': 'tf',
        '@tensorflow/tfjs-converter': 'tf',
      },
      ...output,
    },
    external: [
      '@tensorflow/tfjs-core',
      '@tensorflow/tfjs-converter',
    ],
  };
}

export default [
  config({
    output: {
      format: 'umd',
      name: settings['name'],
      file: `dist/${settings['name']}.js`,
    },
  }),
  config({
    plugins: [minify()],
    output: {
      format: 'umd',
      name: settings['name'],
      file: `dist/${settings['name']}.min.js`,
    },
  }),
  config({
    plugins: [minify()],
    output: {
      format: 'esm',
      file: `dist/${settings['name']}.esm.js`,
    },
  }),
];
